ABSTRACT
The cooperation of companies in the scope of a business network or a network-like connection is a form of organisation that allows carrying out larger projects together with several independent companies. The legal order holds different company forms with a defined liability regime for the organised interaction of several. The presentation of the various bases of liability and liability facilitation with multi-causation in the scope of interface-liability is not only required to determine liability gaps, but also because the forms of liability described may be relevant in their original area of application. The suitability of an action to be completely or merely partially causal for the damage caused is decisive for liability and for possible facilitations regarding the proof of causation. Liability grounds are the breach of network-typical organisation and coordination duties, which are to be classified as special effects of tortious transaction duties.
